body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #0c0c0c;
}

label {
    position: relative;
    width: 88px;
    height: 80px;
    cursor: pointer;
    border-radius: 50%;
}

label .btn {
    position: absolute;
    left: 0;
    top: 0;
    display: block;
    width: 100%;
    height: 100%;
    background: #1b1b1b;
    border-radius: 50%;
    box-shadow: 0 3px 4px rgba(0, 0, 0, 1),
    inset 0 -2px 5px rgba(0, 0, 0, 1),
    inset 0 2px 2px rgba(255, 255, 255, 0.5),
    0 0 0 2px #000,
    0 0 0 5px #0c0c0c,
    0 0 0 6px #808080;
}

label input[type="checkbox"] {
    -webkit-appearance: none;
}

label .fa {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5em;
    color: #0c0c0c;
}

label input[type="checkbox"]:checked ~ .fa {
    color: #00ffe7;
    text-shadow: 0 0 15px #00a1ff, 0 0 30px #00a1ff;
}

label input[type="checkbox"]:checked ~ .btn {
    box-shadow: 0 0 0 rgba(0, 0, 0, 1),
    inset 0 -2px 5px rgba(0, 0, 0, 2),
    inset 0 1px 1px rgba(255, 255, 255, 0.1),
    0 0 0 2px #000,
    0 0 0 5px #0c0c0c,
    0 0 0 6px #00a1ff;
}